Black chrome coating for solar collectors and method of electrodepositing said coating

摘要

A black chrome electrolyte for the formation of selective layers for solar collectors electrolyte comprising chromium trioxide (CrO3), fluorosilic acid (H2SiF6) as a catalyst and soidum molybdate (Na2MoO4. 2H2O). A substrate is brought into contact with the electrolyte at a current density of 0.40 to 0.60 Acm-2 and a bath temperature of less than 20 DEG C. for 15 to 30 secs.